.\"
.\" Copyright (c) 2014-2019 Alfred Klomp
.\" Copyright (c) 2019 Michael Gmelin
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.Dd July 13, 2022
.Dt SHRINKPDF 1
.Os
.Sh NAME
.Nm shrinkpdf
.Nd A simple wrapper around Ghostscript to reduce the file size of PDFs
.Sh SYNOPSIS
.Nm
.Op Fl gh
.Op Fl o Ar outfile
.Op Fl r Ar res
.Ar infile
.Sh DESCRIPTION
Inspired by some code found in an OpenOffice Python script,
.Nm
feeds a PDF through Ghostscript, which performs lossy recompression
by such methods as downsampling the images to a lower resolution.
The result should be (but not always is) a much smaller file.
.Pp
The following options are available:
.Bl -tag -width Fl
.It Fl g
Enable grayscale conversion which can further reduce output size.
.It Fl h
Show help screen.
.It Fl o Ar outfile
Output file, default is standard output.
.It Fl r Ar res
Resolution in DPI, default is 72.
.El
.Pp
If both
.Op infile
and
.Op outfile
are regular files, the script checks if the shrunk output file is actually
smaller than the input file.
If it is not, it writes a message to stderr and copies the input to output.
.Sh EXAMPLES
Reduce PDF resolution to 72 dpi:
.Dl $ shrinkpdf myfile.pdf >myfile-72dpi.pdf
.Pp
Reduce PDF resolution to 300 dpi:
.Dl $ shrinkpdf -r 300 myfile.pdf >myfile-300dpi.pdf
.Pp
Reduce PDF resolution to 150 dpi, specify
.Op outfile :
.Dl $ shrinkpdf -o myfile-150dpi.pdf -r 150 myfile.pdf
.Sh SEE ALSO
.Xr gs 1
.Sh AUTHORS
.An -nosplit
.Nm
was written by Alfred Klomp.
This manual page was written by
.An Michael Gmelin Aq Mt grembo@FreeBSD.org
based on content written by Alfred Klomp.